Selenium vs Tellurium
Pick up to 3 elements and see how they stack up.
| Property | Selenium | Tellurium |
|---|---|---|
| Atomic number | 34 | 52 |
| Atomic mass | 78.971 | 127.6 |
| Electronegativity | 2.55 | 2.1 |
| Melting point | 494 K (220.9 °C) | 722.66 K (449.5 °C) |
| Boiling point | 958 K (684.8 °C) | 1,261 K (987.8 °C) |
| Density | 4.81 g/cm³ | 6.24 g/cm³ |
| Atomic radius | 190 pm | 206 pm |
| Ionization energy | 9.752 eV | 9.01 eV |
| Discovered | 1817 | 1782 |
| Category | Reactive nonmetal | Metalloid |
| State at room temp. | Solid | Solid |
| Block | p | p |
| Group | 16 | 16 |
| Period | 4 | 5 |
| Valence electrons | 6 | 6 |
| Common charges | −2 | −2 |
| Electron configuration | [Ar] 3d10 4s2 4p4 | [Kr] 4d10 5s2 5p4 |